The current version in azuredeploy.json is v7.2 for PHP. This results in a warning in the wordpress dashboard:
PHP is the programming language we use to build and maintain WordPress. Newer versions of PHP are both faster and more secure, so updating will have a positive effect on your site’s performance.
I suggest updating this value to 7.4.
Also, can anyone instruct me in how to update the version of PHP in the app service that I have already deployed?